When people complain about scaling inside their water kettles, this is caused by dissolved calcium and magnesium ions forming calcium and magnesiumcarbonate deposits when hard water is boiled.
民众抱怨水壶产生结垢，系硬水煮沸时其溶解性钙及镁形成碳酸钙及碳酸镁沉淀物所造成。
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Salt is almost always treated with additives (magnesiumcarbonate, magnesium oxide, calcium silicate) to prevent it from absorbing moisture and ensure that it remains free flowing and granular.